Change single-interface mojo bindings to use SequencedTaskRunner.

mojo/public/cpp/bindings/interface_endpoint_client.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_ENDPOINT_CLIENT_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_ENDPOINT_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread_checker.h"
+#include "base/sequence_checker.h"
+#include "base/sequenced_task_runner.h"
 #include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/bindings/connection_error_callback.h"
 #include "mojo/public/cpp/bindings/disconnect_reason.h"
 #include "mojo/public/cpp/bindings/filter_chain.h"
 #include "mojo/public/cpp/bindings/lib/control_message_handler.h"
 #include "mojo/public/cpp/bindings/lib/control_message_proxy.h"
 #include "mojo/public/cpp/bindings/message.h"
 #include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
 
 namespace mojo {
 
 class AssociatedGroup;
 class AssociatedGroupController;
 class InterfaceEndpointController;
 
 // InterfaceEndpointClient handles message sending and receiving of an interface
 // endpoint, either the implementation side or the client side.
 // It should only be accessed and destructed on the creating thread.
 class MOJO_CPP_BINDINGS_EXPORT InterfaceEndpointClient
     : NON_EXPORTED_BASE(public MessageReceiverWithResponder) {
  public:
   // |receiver| is okay to be null. If it is not null, it must outlive this
   // object.
   InterfaceEndpointClient(ScopedInterfaceEndpointHandle handle,
                           MessageReceiverWithResponderStatus* receiver,
                           std::unique_ptr<MessageReceiver> payload_validator,
                           bool expect_sync_requests,
-                          scoped_refptr<base::SingleThreadTaskRunner> runner,
+                          scoped_refptr<base::SequencedTaskRunner> runner,
                           uint32_t interface_version);
   ~InterfaceEndpointClient() override;
 
   // Sets the error handler to receive notifications when an error is
   // encountered.
   void set_connection_error_handler(const base::Closure& error_handler) {
-    DCHECK(thread_checker_.CalledOnValidThread());
+    DCHECK(sequence_checker_.CalledOnValidSequence());
     error_handler_ = error_handler;
     error_with_reason_handler_.Reset();
   }
 
   void set_connection_error_with_reason_handler(
       const ConnectionErrorWithReasonCallback& error_handler) {
-    DCHECK(thread_checker_.CalledOnValidThread());
+    DCHECK(sequence_checker_.CalledOnValidSequence());
     error_with_reason_handler_ = error_handler;
     error_handler_.Reset();
   }
 
   // Returns true if an error was encountered.
   bool encountered_error() const {
-    DCHECK(thread_checker_.CalledOnValidThread());
+    DCHECK(sequence_checker_.CalledOnValidSequence());
     return encountered_error_;
   }
 
   // Returns true if this endpoint has any pending callbacks.
   bool has_pending_responders() const {
-    DCHECK(thread_checker_.CalledOnValidThread());
+    DCHECK(sequence_checker_.CalledOnValidSequence());
     return !async_responders_.empty() || !sync_responses_.empty();
   }
 
   AssociatedGroupController* group_controller() const {
     return handle_.group_controller();
   }
   AssociatedGroup* associated_group();
   uint32_t interface_id() const;
 
   // Adds a MessageReceiver which can filter a message after validation but
@@ skipping 75 matching lines @@
 
   AsyncResponderMap async_responders_;
   SyncResponseMap sync_responses_;
 
   uint64_t next_request_id_;
 
   base::Closure error_handler_;
   ConnectionErrorWithReasonCallback error_with_reason_handler_;
   bool encountered_error_;
 
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   internal::ControlMessageProxy control_message_proxy_;
   internal::ControlMessageHandler control_message_handler_;
 
-  base::ThreadChecker thread_checker_;
+  base::SequenceChecker sequence_checker_;
 
   base::WeakPtrFactory<InterfaceEndpointClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterfaceEndpointClient);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_ENDPOINT_CLIENT_H_